Mizuho Financial Group (NYSE: MFG) CSO details stock and phantom unit holdings

Rhea-AI Filing Summary

Mizuho Financial Group Chief Strategy Officer Naoshi Inomata reports his holdings of common stock and phantom stock units tied to Mizuho common shares. He directly holds 16,773 shares of Common Stock as of the reporting date.

He also holds several grants of phantom stock units, including 21,948 units that are fully vested and settle upon his retirement, each representing one share of common stock payable in cash or stock at Mizuho’s election. Additional phantom unit awards, tied to 5,138, 3,949, and 2,575 underlying shares of common stock, vest in three equal annual installments beginning on July 1, 2024, July 1, 2025, and July 1, 2026, respectively.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Inomata Naoshi

(Last) (First) (Middle)

C/O MIZUHO FINANCIAL GROUP, INC.

1-5-5 OTEMACHI, CHIYODA-KU

(Street)

TOKYO JAPAN 100-8176

(City) (State) (Zip)

JAPAN

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
MIZUHO FINANCIAL GROUP INC [ MFG ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Strategy Officer

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	16,773	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Phantom Stock Units - Retirement	(1)	(1)	Common Stock	21,948	(2)	D
Phantom Stock Units	(3)	(3)	Common Stock	5,138	(2)	D
Phantom Stock Units	(4)	(4)	Common Stock	3,949	(2)	D
Phantom Stock Units	(5)	(5)	Common Stock	2,575	(2)	D

Explanation of Responses:

1. These phantom stock units are fully vested and settle upon the Reporting Person's retirement from the Company.

2. Each phantom stock unit represents a contingent right to receive one share of Issuer Common Stock, which will be settled in cash or common stock upon settlement at the Issuer's election.

3. These phantom stock units vest in three equal annual installments beginning on July 1, 2026.

4. Represents the unvested portion of a grant of phantom stock units which vest in three equal annual installments beginning on July 1, 2025.

5. Represents the unvested portion of a grant of phantom stock units which vest in three equal annual installments beginning on July 1, 2024.

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney.

	/s/ Yuki Nishii, as Attorney-In-Fact	03/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What insider holdings did Mizuho Financial Group (MFG) report for Naoshi Inomata?

Naoshi Inomata reported direct ownership of 16,773 shares of Mizuho Financial Group common stock, plus multiple grants of phantom stock units linked one-for-one to common shares, with a mix of fully vested and time-vested awards.

What are the fully vested phantom stock units held by MFG executive Naoshi Inomata?

Inomata holds 21,948 fully vested phantom stock units that settle upon his retirement. Each unit represents a contingent right to one Mizuho common share, paid in cash or stock at the issuer’s election when settlement occurs.

How do Naoshi Inomata’s phantom stock units at Mizuho (MFG) vest over time?

Some phantom stock units vest in three equal annual installments starting on July 1, 2024, others beginning July 1, 2025, and others beginning July 1, 2026, providing staggered, time-based vesting tied to continued service.

How are Mizuho (MFG) phantom stock units for Naoshi Inomata settled?

Each phantom stock unit gives a contingent right to receive one share of Mizuho common stock. Upon settlement, the company may choose to deliver either cash or common stock, according to its election under the award terms.

Does Naoshi Inomata’s Form 3 show any recent MFG share purchases or sales?

The disclosure lists holdings of common stock and phantom stock units, with transactions classified as holdings and no buy or sell transaction codes. It functions as an initial ownership statement rather than recording open-market trades.